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                <h1 class="post-title" itemprop="name headline"> PHP高级特性二之文件处理 </h1>
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                    <time title="创建时间：2015-03-03 23:54:39" itemprop="dateCreated datePublished" datetime="2015-03-03T23:54:39+08:00">2015-03-03</time>
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                <p>PHP中的文件处理也是一个相当重要的模块，这一篇的主要内容就是PHP中文件系统的简介。</p>
                <h2 id="文件系统用途"><a href="#文件系统用途" class="headerlink" title="文件系统用途"></a>文件系统用途</h2>
                <p>1. 项目处理都离不开文件处理 2. 可以用文件长时间保存数据 3. 建立缓存，在服务器中进行文件操作</p>
                <h2 id="文件系统函数用法详述"><a href="#文件系统函数用法详述" class="headerlink" title="文件系统函数用法详述"></a>文件系统函数用法详述</h2>
                <h3 id="1-基本的判断函数"><a href="#1-基本的判断函数" class="headerlink" title="1.基本的判断函数"></a>1.基本的判断函数</h3>
                <blockquote>
                  <p><a href="http://php.net/manual/zh/function.is-dir.php" target="_blank" rel="noopener">is_dir</a> — 判断给定文件名是否是一个目录 <a href="http://php.net/manual/zh/function.is-file.php" target="_blank" rel="noopener">is_file</a> — 判断给定文件名是否为一个文件 <a href="http://php.net/manual/zh/function.is-executable.php" target="_blank" rel="noopener">is_executable</a> — 判断给定文件名是否可执行 <a href="http://php.net/manual/zh/function.is-link.php" target="_blank" rel="noopener">is_link</a> — 判断给定文件名是否为一个符号连接 <a href="http://php.net/manual/zh/function.is-readable.php" target="_blank" rel="noopener">is_readable</a> — 判断给定文件名是否可读 <a href="http://php.net/manual/zh/function.is-uploaded-file.php" target="_blank" rel="noopener">is_uploaded_file</a> — 判断文件是否是通过 HTTP POST 上传的 <a href="http://php.net/manual/zh/function.is-writable.php" target="_blank" rel="noopener">is_writable</a> — 判断给定的文件名是否可写 <a href="http://php.net/manual/zh/function.is-writeable.php" target="_blank" rel="noopener">is_writeable</a> — is_writable 的别名</p>
                </blockquote>
                <h3 id="2-文件相关信息获取"><a href="#2-文件相关信息获取" class="headerlink" title="2.文件相关信息获取"></a>2.文件相关信息获取</h3>
                <blockquote>
                  <p><a href="http://php.net/manual/zh/function.file-exists.php" target="_blank" rel="noopener">file_exists</a> — 检查文件或目录是否存在 <a href="http://php.net/manual/zh/function.fileatime.php" target="_blank" rel="noopener">fileatime</a> — 取得文件的上次访问时间 <a href="http://php.net/manual/zh/function.filectime.php" target="_blank" rel="noopener">filectime</a> — 取得文件的 inode 修改时间 <a href="http://php.net/manual/zh/function.filegroup.php" target="_blank" rel="noopener">filegroup</a> — 取得文件的组 <a href="http://php.net/manual/zh/function.fileinode.php" target="_blank" rel="noopener">fileinode</a> — 取得文件的 inode <a href="http://php.net/manual/zh/function.filemtime.php" target="_blank" rel="noopener">filemtime</a> — 取得文件修改时间 <a href="http://php.net/manual/zh/function.fileowner.php" target="_blank" rel="noopener">fileowner</a> — 取得文件的所有者 <a href="http://php.net/manual/zh/function.fileperms.php" target="_blank" rel="noopener">fileperms</a> — 取得文件的权限 <a href="http://php.net/manual/zh/function.filesize.php" target="_blank" rel="noopener">filesize</a> — 取得文件大小 <a href="http://php.net/manual/zh/function.filetype.php" target="_blank" rel="noopener">filetype</a> — 取得文件类型</p>
                </blockquote>
                <p>下面我们写一个例子，传入文件名，打印它的详细信息。</p>
                <figure class="highlight php">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">   <span class="function"><span class="keyword">function</span> <span class="title">getFileInfo</span><span class="params">($filename)</span></span>&#123;</span><br><span class="line">       <span class="keyword">if</span>(!file_exists($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> <span class="string">'文件'</span>.($filename).<span class="string">'不存在'</span>;</span><br><span class="line">           <span class="keyword">return</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">if</span>(is_file($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'是一个文件'</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">if</span>(is_dir($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'是一个目录'</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">if</span>(is_executable($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'是可执行文件'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'不是可执行文件'</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">if</span>(is_readable($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'是可读的'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'不是可读的'</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">if</span>(is_writable($filename))&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'是可写入的'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">           <span class="keyword">echo</span> $filename.<span class="string">'不是可写入的'</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的大小是'</span>.getFileSize(filesize($filename)).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的类型是'</span>.filetype($filename).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的所有者是'</span>.fileowner($filename).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的最后访问时间为'</span>.getTime(fileatime($filename)).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的inode是'</span>.fileinode($filename).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的修改时间是'</span>.getTime(filemtime($filename)).<span class="string">''</span>;</span><br><span class="line">       <span class="keyword">echo</span> <span class="string">'文件'</span>.$filename.<span class="string">'的权限是'</span>.fileperms($filename).<span class="string">''</span>;</span><br><span class="line">&#125;</span><br><span class="line">   </span><br><span class="line">   <span class="function"><span class="keyword">function</span> <span class="title">getTime</span><span class="params">($time)</span></span>&#123;</span><br><span class="line">       <span class="keyword">return</span> date(<span class="string">'Y-m-d H:i:s'</span>,$time);</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="function"><span class="keyword">function</span> <span class="title">getFileSize</span><span class="params">($size)</span></span>&#123;</span><br><span class="line">       $dw = <span class="string">'B'</span>;</span><br><span class="line">       <span class="keyword">if</span>($size&gt;=pow(<span class="number">2</span>,<span class="number">40</span>))&#123;</span><br><span class="line">           $size=round($size/pow(<span class="number">2</span>,<span class="number">40</span>),<span class="number">2</span>);</span><br><span class="line">           $dw = <span class="string">'PB'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span> <span class="keyword">if</span>($size&gt;=pow(<span class="number">2</span>,<span class="number">30</span>))&#123;</span><br><span class="line">           $size=round($size/pow(<span class="number">2</span>,<span class="number">30</span>),<span class="number">2</span>);</span><br><span class="line">           $dw = <span class="string">'TB'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span> <span class="keyword">if</span>($size&gt;=pow(<span class="number">2</span>,<span class="number">20</span>))&#123;</span><br><span class="line">           $size=round($size/pow(<span class="number">2</span>,<span class="number">20</span>),<span class="number">2</span>);</span><br><span class="line">           $dw = <span class="string">'GB'</span>;</span><br><span class="line">       &#125;<span class="keyword">else</span> <span class="keyword">if</span>($size&gt;=pow(<span class="number">2</span>,<span class="number">10</span>))&#123;</span><br><span class="line">           $size=round($size/pow(<span class="number">2</span>,<span class="number">10</span>),<span class="number">2</span>);</span><br><span class="line">           $dw = <span class="string">'MB'</span>;</span><br><span class="line">       &#125;</span><br><span class="line">       <span class="keyword">return</span> $size.$dw;</span><br><span class="line">   &#125;</span><br><span class="line">   getFileInfo(<span class="string">'1.php'</span>);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>运行结果</p>
                <blockquote>
                  <p>1.php是一个文件 1.php不是可执行文件 1.php是可读的 1.php不是可写入的 文件1.php的大小是2MB 文件1.php的类型是file 文件1.php的所有者是1000 文件1.php的最后访问时间为2015-03-04 12:58:33 文件1.php的inode是536185 文件1.php的修改时间是2015-03-04 12:58:32 文件1.php的权限是33204</p>
                </blockquote>
                <h3 id="3-文件路径相关函数"><a href="#3-文件路径相关函数" class="headerlink" title="3.文件路径相关函数"></a>3.文件路径相关函数</h3>
                <p><strong>相对路径：相对于当前目录的上级和下级目录</strong></p>
                <blockquote>
                  <p>. 当前目录 .. 上一级目录</p>
                </blockquote>
                <p><strong>路径分隔符号</strong></p>
                <blockquote>
                  <p>linux/Unix “/“ windows “\“ 不管是什么操作系统PHP的目录分割符号都支技 / (Linux)</p>
                </blockquote>
                <p><strong>绝对路径：可以指的操作系统的根，也可以指的是存放网站的文档根目录</strong></p>
                <blockquote>
                  <p>如果是在服务器中执行（通过PHP文件处理函数执行）路径 则 “根”指的就是操作系统的根 如果程序是下载的客户端，再访问服务器中的文件时，只有通过Apache访问，“根”也就指的是文档根目录</p>
                </blockquote>
                <p>三个相关函数</p>
                <blockquote>
                  <p><a href="http://php.net/manual/zh/function.basename.php" target="_blank" rel="noopener">basename</a> — 返回路径中的文件名部分 <a href="http://php.net/manual/zh/function.dirname.php" target="_blank" rel="noopener">dirname</a> — 返回路径中的目录部分 <a href="http://php.net/manual/zh/function.pathinfo.php" target="_blank" rel="noopener">pathinfo</a> — 返回文件路径的信息</p>
                </blockquote>
                <p>例如下面的例子</p>
                <figure class="highlight bash">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">   <span class="variable">$url1</span>=<span class="string">"./aaa/bbb/index.php"</span>;</span><br><span class="line"><span class="variable">$url2</span>=<span class="string">"../www/yyy/login.rar"</span>;</span><br><span class="line"><span class="variable">$url3</span>=<span class="string">"c:/appserv/www/demo.html"</span>;</span><br><span class="line"><span class="variable">$url4</span>=<span class="string">"http://localhost/yyy/www.gif"</span>;</span><br><span class="line"><span class="built_in">echo</span> basename(<span class="variable">$url1</span>);</span><br><span class="line"><span class="built_in">echo</span> basename(<span class="variable">$url2</span>);</span><br><span class="line"><span class="built_in">echo</span> basename(<span class="variable">$url3</span>);</span><br><span class="line"><span class="built_in">echo</span> basename(<span class="variable">$url4</span>);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>运行结果</p>
                <blockquote>
                  <p>index.php login.rar demo.html www.gif</p>
                </blockquote>
                <p>可以看出，basename这个函数返回的是文件的名，也就是最后一个项目。 下面我们看一下dirname的用法</p>
                <figure class="highlight mel">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">   $url1=<span class="string">"./aaa/bbb/index.php"</span>;</span><br><span class="line">$url2=<span class="string">"../www/yyy/login.rar"</span>;</span><br><span class="line">$url3=<span class="string">"c:/appserv/www/demo.html"</span>;</span><br><span class="line">$url4=<span class="string">"http://localhost/yyy/www.gif"</span>;</span><br><span class="line">echo <span class="keyword">dirname</span>(<span class="keyword">dirname</span>($url1));</span><br><span class="line">echo <span class="keyword">dirname</span>($url2);</span><br><span class="line">echo <span class="keyword">dirname</span>($url3);</span><br><span class="line">echo <span class="keyword">dirname</span>($url4);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>运行结果</p>
                <blockquote>
                  <p>./aaa ../www/yyy c:/appserv/www <a href="http://localhost/yyy" target="_blank" rel="noopener">http://localhost/yyy</a></p>
                </blockquote>
                <p>可以发现，dirname这个函数可以多层嵌套使用，返回的就是它所在的路径，即除了最后一项之外所有的项。 另外 pathinfo的以上所有信息都可以获取到，另外还包括了文件名和扩展名 比如下面的结果</p>
                <blockquote>
                  <p>Array ( [dirname] =&gt; ../www/yyy [basename] =&gt; login.rar [extension] =&gt; rar [filename] =&gt; login )</p>
                </blockquote>
                <h3 id="4-文件的创建删除修改"><a href="#4-文件的创建删除修改" class="headerlink" title="4. 文件的创建删除修改"></a>4. 文件的创建删除修改</h3>
                <blockquote>
                  <p><a href="http://php.net/manual/zh/function.touch.php" target="_blank" rel="noopener">touch</a> — 创建一个文件 <a href="http://php.net/manual/zh/function.unlink.php" target="_blank" rel="noopener">unlink</a> — 删除文件 <a href="http://php.net/manual/zh/function.rename.php" target="_blank" rel="noopener">rename</a> — 重命名一个文件或目录 <a href="http://php.net/manual/zh/function.copy.php" target="_blank" rel="noopener">copy</a> — 拷贝文件</p>
                </blockquote>
                <p>例如下面的例子</p>
                <figure class="highlight less">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="selector-tag">touch</span>(<span class="string">"./php.apahce"</span>); <span class="comment">//创建文件</span></span><br><span class="line"><span class="selector-tag">unlink</span>(<span class="string">"C:/AppServ/www/xsphp/apache.php"</span>);  <span class="comment">//删除文件</span></span><br><span class="line"><span class="selector-tag">rename</span>(<span class="string">"./test.txt"</span>, <span class="string">"d:/test2.txt"</span>);    <span class="comment">//重命名文件</span></span><br><span class="line"><span class="selector-tag">copy</span>(<span class="string">"cache.txt"</span>, <span class="string">"./cache5.txt"</span>);   <span class="comment">//复制文件</span></span><br><span class="line"><span class="selector-tag">chmod</span>(<span class="string">"a.txt"</span>,<span class="number">755</span>);   <span class="comment">//设置文件权限</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>权限相关内容</p>
                <blockquote>
                  <p>rwx 表这个文件的拥有者 r读 w写 x执行 rwx 表这个文件的拥有者所在的组 r读 w写 x执行 rwx 其它用户对这个为文件的权限 r读 w写 x执行</p>
                </blockquote>
                <h2 id="文件读写"><a href="#文件读写" class="headerlink" title="文件读写"></a>文件读写</h2>
                <h3 id="1-file-get-contents-string"><a href="#1-file-get-contents-string" class="headerlink" title="1. file_get_contents(string)"></a>1. file_get_contents(string)</h3>
                <p>传入文件名，直接得到文件中的文本信息，返回的内容即为文件中的文本。 例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span></span></span><br><span class="line"><span class="php"> $str = file_get_contents(<span class="string">"1.txt"</span>);</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> $str;</span></span><br><span class="line"><span class="php"> <span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>则直接打开了 1.txt 文件中的内容，并返回文件中的文本信息。 如果文件不存在，那么会提示</p>
                <blockquote>
                  <p><strong>Warning</strong>: file_get_contents(2.txt): failed to open stream: No such file or directory</p>
                </blockquote>
                <p>同样，文件还可以是远程文件，例如，参数传入 <a href="http://www.qq.com" target="_blank" rel="noopener">http://www.qq.com</a> 即可以呈现腾讯网的首页内容。 缺点：不能读取指定部分的内容，一次性全部读取。</p>
                <h3 id="2-file-put-contents-filename-content"><a href="#2-file-put-contents-filename-content" class="headerlink" title="2. file_put_contents(filename,content)"></a>2. file_put_contents(filename,content)</h3>
                <p>写入文件，filename是写入文件的文件名，content是写入内容，返回值是成功写入的字符长度。</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> file_put_contents(<span class="string">"2.txt"</span>,<span class="string">'abcd'</span>);</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>2.txt 文件如果不存在，那么则会创建这个文件并写入 abcd 这个字符串，返回 4 ，为字符串的长度。 如果文件存在，则会将文件清空，然后写入字符串，返回写入长度。 缺点：不能以追加的方式写入文件。</p>
                <h3 id="3-file-filename"><a href="#3-file-filename" class="headerlink" title="3.file(filename)"></a>3.file(filename)</h3>
                <p>file是直接打开某一个文件，返回的结果是一个数组，每一行是数组的一个元素。也就是说，获取行数只需要输出数组的大小即可。例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $str = file(<span class="string">"1.txt"</span>);</span></span><br><span class="line"><span class="php"> var_dump($str);</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> count($str);</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>即可得到数组形式的行内容，而且输出了行数。 缺点：不能读取指定部分的内容。</p>
                <h3 id="4-fopen-filename-mode"><a href="#4-fopen-filename-mode" class="headerlink" title="4.fopen(filename,mode)"></a>4.fopen(filename,mode)</h3>
                <p>filename是文件名，可以是路径加名，也可以是远程服务器文件。 mode是打开文件的方式</p>
                <blockquote>
                  <p>r，以只读模式打开文件 r+，除了读，还可以写入。 w， 以只写的方式打开，如果文件不存在，则创建这个文件,并写放内容，如果文件存在，并原来有内容，则会清除原文件中所有内容，再写入（打开已有的重要文件） w+，除了可以写用fwrite, 还可以读fread a，以只写的方式打开，如果文件不存在，则创建这个文件，并写放内容，如果文件存在，并原来有内容，则不清除原有文件内容，再原有文件内容的最后写入新内容，（追加） a+，除了可以写用fwrite, 还可以读fread b，以二进制模式打开文件（图，电影） t，以文本模式打开文件</p>
                </blockquote>
                <p>注意：</p>
                <blockquote>
                  <p>r+具有读写属性，从文件头开始写，保留原文件中没有被覆盖的内容； w+具有读写属性，写的时候如果文件存在，会被清空，从头开始写。</p>
                </blockquote>
                <p>返回的是一个文件资源</p>
                <h3 id="5-fwrite-file-content"><a href="#5-fwrite-file-content" class="headerlink" title="5.fwrite(file,content)"></a>5.fwrite(file,content)</h3>
                <p>文件写入功能，file是文件资源，用fopen函数获取来的，content是写入内容。同 fputs 函数。 例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $file = fopen(<span class="string">"1.txt"</span>,<span class="string">"r+"</span>);</span></span><br><span class="line"><span class="php"> $result = fwrite($file,<span class="string">"xx"</span>);</span></span><br><span class="line"><span class="php"> <span class="keyword">if</span>($result)&#123;</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> <span class="string">"Success"</span>;</span></span><br><span class="line"><span class="php"> &#125;<span class="keyword">else</span></span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> <span class="string">"Failed"</span>;</span></span><br><span class="line"><span class="php"> &#125;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>则从头开始写入资源，即把前两个字符设为 xx</p>
                <h3 id="6-fread-file-size"><a href="#6-fread-file-size" class="headerlink" title="6. fread(file,size)"></a>6. fread(file,size)</h3>
                <p>读取文件指定部分的长度，file是文件资源，由fopen返回的对象，size是读取字符的长度。 例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $file = fopen(<span class="string">"1.txt"</span>,<span class="string">"r"</span>);</span></span><br><span class="line"><span class="php"> $content = fread($file,filesize(<span class="string">"1.txt"</span>));</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> $content;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>不过，上述的 filesize 方法只能获取本地文件大小，对于远程文件的读取就要换一种方法了。 例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $file = fopen(<span class="string">"http://www.qq.com"</span>,<span class="string">"r"</span>);</span></span><br><span class="line"><span class="php"> $str = <span class="string">""</span>;</span></span><br><span class="line"><span class="php"> <span class="keyword">while</span>(!feof($file))&#123;  <span class="comment">//判断时候到了文件结尾</span></span></span><br><span class="line"><span class="php"> $str.=fread($file,<span class="number">1024</span>);</span></span><br><span class="line"><span class="php"> &#125;</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> $str;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <h3 id="7-fgets-file"><a href="#7-fgets-file" class="headerlink" title="7.fgets(file)"></a>7.fgets(file)</h3>
                <p>file是文件资源，每次读取一行。例如我们读取出腾讯首页一共有多少行。</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"> <span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $file = fopen(<span class="string">"http://www.qq.com"</span>,<span class="string">"r"</span>);</span></span><br><span class="line"><span class="php"> $str = <span class="string">""</span>;</span></span><br><span class="line"><span class="php"> $count = <span class="number">0</span>;</span></span><br><span class="line"><span class="php"> <span class="keyword">while</span>(!feof($file))&#123;</span></span><br><span class="line"><span class="php"> $str .= fgets($file);</span></span><br><span class="line"><span class="php"> $count ++;</span></span><br><span class="line"><span class="php"> &#125;</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> $count;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>会输出结果 8893，我们可以查看源文件，看看它一共有多少行，验证一下即可。</p>
                <h3 id="7-fgetc-file"><a href="#7-fgetc-file" class="headerlink" title="7.fgetc(file)"></a>7.fgetc(file)</h3>
                <p>与fgets方法很相似，file是文件资源，每次读取个字符。例如我们读取出腾讯首页一共有多少个字符。</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> $file = fopen(<span class="string">"http://www.qq.com"</span>,<span class="string">"r"</span>);</span></span><br><span class="line"><span class="php"> $str = <span class="string">""</span>;</span></span><br><span class="line"><span class="php"> $count = <span class="number">0</span>;</span></span><br><span class="line"><span class="php"> <span class="keyword">while</span>(!feof($file))&#123;</span></span><br><span class="line"><span class="php"> $str .= fgetc($file);</span></span><br><span class="line"><span class="php"> $count ++;</span></span><br><span class="line"><span class="php"> &#125;</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> $count;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>上述代码便会输出所有的字符数量。</p>
                <h3 id="8-ftell-file"><a href="#8-ftell-file" class="headerlink" title="8.ftell(file)"></a>8.ftell(file)</h3>
                <p>ftell 是返回当前读文件的指针位置，file 是文件资源，是由 fopen 返回的对象。</p>
                <h3 id="9-fseek-file-offset-whence"><a href="#9-fseek-file-offset-whence" class="headerlink" title="9.fseek(file,offset,whence)"></a>9.fseek(file,offset,whence)</h3>
                <p><strong>file</strong> 文件系统指针，是典型地由 fopen() 创建的 resource(资源)。 <strong>offset</strong> 偏移量。 要移动到文件尾之前的位置，需要给 offset 传递一个负值，并设置 whence 为 SEEK_END。 <strong>whence</strong></p>
                <blockquote>
                  <p>SEEK_SET - 设定位置等于 offset 字节。 SEEK_CUR - 设定位置为当前位置加上 offset。 SEEK_END - 设定位置为文件尾加上 offset。</p>
                </blockquote>
                <h3 id="10-rewind-file"><a href="#10-rewind-file" class="headerlink" title="10.rewind($file)"></a>10.rewind($file)</h3>
                <p>回到文件头部，file是文件资源 例如</p>
                <figure class="highlight gams">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;?php </span><br><span class="line"> <span class="symbol">$</span><span class="keyword">file</span> = fopen(<span class="string">"1.txt"</span>,<span class="string">"r"</span>);</span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出读取前的指针位置</span></span><br><span class="line"> echo fread(<span class="symbol">$</span><span class="keyword">file</span>,<span class="number">10</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//读取10个字符，指针移动10个单位</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出读取完之后当前指针位置</span></span><br><span class="line"> fseek(<span class="symbol">$</span><span class="keyword">file</span>,<span class="number">20</span>,SEEK_CUR); <span class="comment">//当前指针前移20单位</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出移动之后指针的位置</span></span><br><span class="line"> echo fread(<span class="symbol">$</span><span class="keyword">file</span>,<span class="number">10</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出读取的10个字符</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出读完10个字符之后指针的位置</span></span><br><span class="line"> fseek(<span class="symbol">$</span><span class="keyword">file</span>,<span class="number">-20</span>,SEEK_END); <span class="comment">//指针移动到文件末尾前20个字符</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出移动之后指针的位置</span></span><br><span class="line"> echo fread(<span class="symbol">$</span><span class="keyword">file</span>,<span class="number">10</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出文件末尾20个字符</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出读完10个字符之后指针的位置</span></span><br><span class="line"> rewind(<span class="symbol">$</span><span class="keyword">file</span>); <span class="comment">//回到文件头部</span></span><br><span class="line"> echo ftell(<span class="symbol">$</span><span class="keyword">file</span>).<span class="string">"&lt;br&gt;"</span>; <span class="comment">//输出移动之后指针的位置</span></span><br><span class="line">?&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>运行结果：</p>
                <blockquote>
                  <p>0 cuiqingcai 10 30 uiqingcai. 40 374 i.comcuiqi 384 0</p>
                </blockquote>
                <h3 id="11-flock-file-operation-wouldblock"><a href="#11-flock-file-operation-wouldblock" class="headerlink" title="11.flock(file,operation[,wouldblock])"></a>11.flock(file,operation[,wouldblock])</h3>
                <p><strong>file</strong> 文件资源指针，是典型地由 fopen() 创建的 resource(资源)。 <strong>operation</strong> operation 可以是以下值之一：</p>
                <blockquote>
                  <p>LOCK_SH取得共享锁定（读取的程序）。 LOCK_EX 取得独占锁定（写入的程序。 LOCK_UN 释放锁定（无论共享或独占）。</p>
                </blockquote>
                <p>如果不希望 flock() 在锁定时堵塞，则是 LOCK_NB（Windows 上还不支持）。 <strong>wouldblock</strong> 如果锁定会堵塞的话（EWOULDBLOCK 错误码情况下），可选的第三个参数会被设置为 TRUE。（Windows 上不支持） 例如</p>
                <figure class="highlight gams">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;?php </span><br><span class="line"> <span class="symbol">$</span><span class="keyword">file</span> = fopen(<span class="string">"1.txt"</span>,<span class="string">"a"</span>);</span><br><span class="line"> <span class="keyword">if</span>(flock(<span class="symbol">$</span><span class="keyword">file</span>,LOCK_EX))&#123;</span><br><span class="line"> fwrite(<span class="symbol">$</span><span class="keyword">file</span>,<span class="string">"xxx"</span>);</span><br><span class="line"> flock(<span class="symbol">$</span><span class="keyword">file</span>,LOCK_UN);</span><br><span class="line"> &#125;</span><br><span class="line">?&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
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                  <li class="nav-item nav-level-2"><a class="nav-link" href="#文件系统用途"><span class="nav-number">1.</span> <span class="nav-text">文件系统用途</span></a></li>
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                      <li class="nav-item nav-level-3"><a class="nav-link" href="#1-file-get-contents-string"><span class="nav-number">3.1.</span> <span class="nav-text">1. file_get_contents(string)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#2-file-put-contents-filename-content"><span class="nav-number">3.2.</span> <span class="nav-text">2. file_put_contents(filename,content)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#3-file-filename"><span class="nav-number">3.3.</span> <span class="nav-text">3.file(filename)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#4-fopen-filename-mode"><span class="nav-number">3.4.</span> <span class="nav-text">4.fopen(filename,mode)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#5-fwrite-file-content"><span class="nav-number">3.5.</span> <span class="nav-text">5.fwrite(file,content)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#6-fread-file-size"><span class="nav-number">3.6.</span> <span class="nav-text">6. fread(file,size)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#7-fgets-file"><span class="nav-number">3.7.</span> <span class="nav-text">7.fgets(file)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#7-fgetc-file"><span class="nav-number">3.8.</span> <span class="nav-text">7.fgetc(file)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#8-ftell-file"><span class="nav-number">3.9.</span> <span class="nav-text">8.ftell(file)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#9-fseek-file-offset-whence"><span class="nav-number">3.10.</span> <span class="nav-text">9.fseek(file,offset,whence)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#10-rewind-file"><span class="nav-number">3.11.</span> <span class="nav-text">10.rewind($file)</span></a></li>
                      <li class="nav-item nav-level-3"><a class="nav-link" href="#11-flock-file-operation-wouldblock"><span class="nav-number">3.12.</span> <span class="nav-text">11.flock(file,operation[,wouldblock])</span></a></li>
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10px;">pywin32</a> <a href="/tags/style/" style="font-size: 10px;">style</a> <a href="/tags/tomcat/" style="font-size: 10px;">tomcat</a> <a href="/tags/ubuntu/" style="font-size: 10px;">ubuntu</a> <a href="/tags/uwsgi/" style="font-size: 10px;">uwsgi</a> <a href="/tags/vsftpd/" style="font-size: 10px;">vsftpd</a> <a href="/tags/wamp/" style="font-size: 10px;">wamp</a> <a href="/tags/wineQQ/" style="font-size: 10px;">wineQQ</a> <a href="/tags/%E4%B8%83%E7%89%9B/" style="font-size: 11.25px;">七牛</a> <a href="/tags/%E4%B8%8A%E6%B5%B7/" style="font-size: 10px;">上海</a> <a href="/tags/%E4%B8%AA%E4%BA%BA%E7%BD%91%E7%AB%99/" style="font-size: 10px;">个人网站</a> <a href="/tags/%E4%B8%BB%E9%A2%98/" style="font-size: 10px;">主题</a> <a href="/tags/%E4%BA%91%E4%BA%A7%E5%93%81/" style="font-size: 10px;">云产品</a> <a href="/tags/%E4%BA%91%E5%AD%98%E5%82%A8/" style="font-size: 10px;">云存储</a> <a href="/tags/%E4%BA%AC%E4%B8%9C%E4%BA%91/" style="font-size: 10px;">京东云</a> <a 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style="font-size: 10px;">暗时间</a> <a href="/tags/%E6%9D%9C%E5%85%B0%E7%89%B9/" style="font-size: 11.25px;">杜兰特</a> <a href="/tags/%E6%A1%8C%E9%9D%A2/" style="font-size: 10px;">桌面</a> <a href="/tags/%E6%AD%8C%E5%8D%95/" style="font-size: 10px;">歌单</a> <a href="/tags/%E6%B1%9F%E5%8D%97/" style="font-size: 10px;">江南</a> <a href="/tags/%E6%B8%B8%E6%88%8F/" style="font-size: 10px;">游戏</a> <a href="/tags/%E7%84%A6%E8%99%91/" style="font-size: 10px;">焦虑</a> <a href="/tags/%E7%88%AC%E8%99%AB/" style="font-size: 16.25px;">爬虫</a> <a href="/tags/%E7%88%AC%E8%99%AB%E4%B9%A6%E7%B1%8D/" style="font-size: 11.25px;">爬虫书籍</a> <a href="/tags/%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F/" style="font-size: 10px;">环境变量</a> <a href="/tags/%E7%94%9F%E6%B4%BB%E7%AC%94%E8%AE%B0/" style="font-size: 10px;">生活笔记</a> <a href="/tags/%E7%99%BB%E5%BD%95/" style="font-size: 10px;">登录</a> <a href="/tags/%E7%9F%A5%E4%B9%8E/" style="font-size: 10px;">知乎</a> <a href="/tags/%E7%9F%AD%E4%BF%A1/" style="font-size: 10px;">短信</a> <a 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